Every Saturday at 20:00 UTC

Next Jam:

Only a few hours after One hour game jam will be the start of one of the coolest jams out there, and likely the last one of its kind: Zero Hour Game Jam runs on Sunday 25 Oct from 1AM-1AM (UK time) and 2AM-2AM (Central European time). This is likely to be your last chance to make a video game in zero hours, at least in Europe! (US version is on 1 Nov)

Also 1hgj next week will still be at 8PM UTC, but that now means 8PM UTC and 9PM CET. Check for other time zones.


This page contains information of how Jams work and the rules.


Every Saturday at 20:00 UTC. The time in your local time and a countdown-timer should be in the top of the site though.


Right here! Joining our Discord server is however a good idea.

Is there a theme?

Yes! At the start of the hour, the theme is announced on the site and on Discord. Themes are suggested and voted by the community on the Theme Voting page.

How long do I have to finish?


Do I have to submit within the hour?

No. Keep working on your game until it's done, then submit.

Can I use premade assets?

You are free to use premade assets but it is recommended that you make at least one game from scratch. Some assets are provided on the Assets page but you do not have to use them.

Do I have to host the games myself?

Yes, you'll need to host the game and submit the links here. We host the thumbnail though. If you don't have a website yourself, use something like dropbox / google drive, or itch.io / newgrounds. Ask on Discord for more suggestions.

What happens after the jam?

About 30 minutes after the jam ends, we host a stream on Twitch where all submitted games are played. The stream usually lasts about 2 hours. It's not always the same people streaming though, so keep an eye on Discord to see who's streaming.

What if I don't finish in time?

If you finish and submit your game before the stream ends, we'll play it on stream, even if it took you more than an hour to finish.

Can I participate after the jam has ended?

If you come late you can still participate. If the stream is over, then your game won't be played on-stream, obviously, but we'll still keep it on the site!

Copyright / licenses / future development / intellectual property / ...?

You retain full ownership / copyright / yadda yadda. If you get a BAFTA make sure to mention us in your acceptance speech though :D

Can I submit as a team?

Team entries are allowed but currently not supported by the website. Please keep in mind that it can be challenging to manage a team within an hour.